The file contains the isohypsen 1st water-feeding package (average). The data are derived from the average highest groundwater level (GHG), the average spring ground water level (GVG) and the average lowest groundwater level (GLG) situation 2003. The data have been corrected for surface water levels and clay bulkheads. An isohypse or height line is a line on a map that connects points of equal height above sea level. A water-feeding package is a soil layer that passes through water and is bounded at the top and bottom by an impermeable layer or by a free water level.
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